BIF 2019: The Next Generation of Genetic Tools

John Genho
Neogen GeneSeek






The genomic indicator of retained heterosis significantly predicted the heifer pregnancy and stayability of crossed cows in the University of Alberta data. Genho also looked at this in King Ranch and Eldon Farms data, and the genomic measures of heterosis and retained heterosis predicted heifer pregnancy and stayability.

You can't fix heterosis in a herd by selecting for it. Mendelian segregation means that each generation of mating crossbreeds you end up with homozygous loci in the progeny. These homozygous loci result in decreased heterosis.


Joe Paschal said…
You are right on. You cannot select in the traditional sense for heterosis! I haven't read the Canadian work but heterosis is the sum of thousands of genetic interactions, I doubt there are major genes as was once considered in additive genetic action. The reason that so many of the American breeds (those with Brahman genetics) and the American Tweeners (those more recent with solely Bos taurus)was to provide those with smaller herds that could not create their own crossbreds an opportunity to use heterosis more easily and less expensively. However, no matter the current re-emphasis on heterosis or hybrid vigor, the breed effect should not be ignored. The Lasaters and the Klebergs and many others understood that.
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